Datsun 280Z -77 - Build thread

uk66fastback said:
Great work Peter! You must be looking forward to that first turn of the key ...
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Thank you!

I am indeed.

Sadly my tuner/shop is 1,5 hours away, so I will not be present when they start it up or do the mapping. But I'm very much looking forward driving it home from there!
 
peter_s said:
Thank you!

I am indeed.

Sadly my tuner/shop is 1,5 hours away, so I will not be present when they start it up or do the mapping. But I'm very much looking forward driving it home from there!
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I'm sure someone will video it for you. Everything gets recorded these days.
 
Took a little road trip with the Datsun yesterday.

Sadly not under its own power :D

It's now in very good hands.
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I would treat anything over 7500 as being in the 'death-zone' and only for the brave adventurer. But we all need pioneers to push the limits and discover.
 
I'm not worried about that.

The whole crank shaft is modified for good balance at high rpm. Pistons are very light, as are the rods.

There is a huge crank vibration damper to take care of the 3rd harmonic vibrations which is what's so dangerous for straight 6 engines at high rpm.

According to DSI, 10k rpm is doable with this engine. The recommended rpm for my application which includes circuit driving is around 8500.

Of course, the higher the rpm, the shorter the life span of the engine. But the engine is built to withstand 8500 long term (a relative term ;))
 
Wow, 8500 equates to each valve opening and closing 70 times per second, each piston rising and falling 140 times per second. I'd feel safer if it was buckets and shims not rockers. I suppose bike engines do that but components are smaller and lighter.

I assume you will get lots of power around 6-7000 anyway.
 
7500 rpm is still opening and closing 62.5 times per second, which doesn't seem significantly less challenging!
 
Rob Gaskin said:
Wow, 8500 equates to each valve opening and closing 70 times per second, each piston rising and falling 140 times per second. I'd feel safer if it was buckets and shims not rockers. I suppose bike engines do that but components are smaller and lighter.

I assume you will get lots of power around 6-7000 anyway.
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I had a Honda mc22, 250cc 4 stroke with a 21000rpm redline
 
I'm sure you're mostly all fine with those engine speeds, but I would just have too much mechanical sympathy and a smaller wallet to let anything I owned get remotely near them!
 
uk66fastback said:
I'm sure you're mostly all fine with those engine speeds, but I would just have too much mechanical sympathy and a smaller wallet to let anything I owned get remotely near them!
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I think that depends on the balance and powerband.

If a engine is built for high rpms and has a cam for that, that's what you want to do. It just feels natural, it's what the engine wants to do.
 
I used to rev my 1.6 Type R engine to 9000, which is crazy to think about in a road car engine. But the engine loved it up there and never missed a beat and it was so much fun to keep on the boil.
 
Ian said:
I used to rev my 1.6 Type R engine to 9000, which is crazy to think about in a road car engine. But the engine loved it up there and never missed a beat and it was so much fun to keep on the boil.
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Those EK9s are something else.
 
Ian said:
I used to rev my 1.6 Type R engine to 9000, which is crazy to think about in a road car engine. But the engine loved it up there and never missed a beat and it was so much fun to keep on the boil.
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I would imagine that it was dohc with 4 small valves per cylinder and buckets and shims not rockers.
 
My 1968 Singer Chamois Sport will rev to 8k. A bit of balancing and tuning and they go to 10k. Single oh cam, 2 valves per cylinder.
 
Geoff-R said:
Those EK9s are something else.
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The engine was from an EK9, but tuned and in an EF9, which is advantageous as its about 150kg less than an EK9.



Rob Gaskin said:
I would imagine that it was dohc with 4 small valves per cylinder and buckets and shims not rockers.
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4 cylinder DOHC but it does have rockers.


My RB26 Revs to 8200 so I can still get my high RPM fun, its actually got a built head so if I had a turbo capable of supplying boost at higher RPM I could rev to 9K.
 
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